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Internet photo geospatial positioning method based on street views

A positioning method and geospatial technology, applied in geographic information databases, electronic digital data processing, special data processing applications, etc., can solve problems such as the absence of crowdsourced photos, limited accuracy of photo retrieval and positioning, and the inability to obtain the absolute geographic location of photos to be queried, etc. problem, to achieve the effect of increasing usability and applicability

Inactive Publication Date: 2017-09-05
NANJING UNIV +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] Due to the limited positioning accuracy of simple photo retrieval and crowdsourced photos without geographic tags, even if a relative 3D model based on crowdsourced photos and the photo to be queried is established, the absolute geographic location of the photo to be queried cannot be obtained

Method used

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  • Internet photo geospatial positioning method based on street views
  • Internet photo geospatial positioning method based on street views
  • Internet photo geospatial positioning method based on street views

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Embodiment Construction

[0045] The present invention is described in detail below according to the accompanying drawings, so that the technical route and operation steps of the present invention are clearer.

[0046] In this embodiment, Jianye District, one of the main urban areas of Nanjing, is selected as the experimental area, which is east of the Yangtze River and west of the Qinhuai River. figure 2 shown. In 2014, the Youth Olympic Games was grandly held here. In the "Post-Youth Olympic" period, Jianye District undertakes the great mission of building a modernized new Nanjing and will develop into a new center of a modernized international city. It is the most representative epitome of Nanjing's development, and its street information largely It can reflect the streetscape of Nanjing. The downloaded street view data covers nearly 180 kilometers of urban roads, with a total of about 15,000 sampling points, and the street view photo library has a data volume of 120,000 pieces.

[0047] This em...

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Abstract

The invention relates to an internet photo geospatial positioning method based on street views, comprising the steps of preprocessing a street photo gallery, extracting and describing features, and establishing a feature index; querying a nearest-neighbor feature of each feature of a photo to be queried, performing voting, trimming and smoothening voting results to obtain a most similar photo, using the most similar photo as a center of circle to delimit a buffer area according to a distance between two known street view points; calculating similarity of street photos in the buffer area to the photo to be queried so as to screen out photos of high similarity to form a similar photo set; subjecting both the similar photo set and the photo to be queried to feature extraction and matching, using an SfM (structure from motion) algorithm to register the photos, and generating a relative positional relationship between a sparse point cloud and a camera; calculating exterior orientation elements of the unknown photo to be queried according to the known street view point coordinates so as to finish positioning and orientating. Practice proves that the method provided herein enables electronic photos of any source on the internet to be positioned accurately.

Description

technical field [0001] The present invention relates to a photo geolocation method, in particular to an accurate photo geolocation method based on street view photos and adopting a three-step strategy of "image retrieval-matching identification-three-dimensional reconstruction". Background technique [0002] The street is the framework of the city, a vibrant urban space (Parthasarathi P, 2014). Life is inseparable from the streets, and the daily activities of citizens, such as commuting, shopping, entertainment and other travel for any purpose, rely on urban streets (Jacobs, 1993). With the popularization of electronic products (such as mobile phones), citizens record the details of their lives on the street with their mobile phones, and then upload them to the Internet as a record of life. In foreign countries, users upload a large number of photos to photo sharing sites such as Flickr and Panoramio. In China, users upload to social networking sites such as Weibo, Space, a...

Claims

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Application Information

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IPC IPC(8): G06F17/30
CPCG06F16/29G06F16/583G06F16/5866
Inventor 程亮袁一李满春楚森森孙越凡陈振杰魏晓燕李舒怡谌颂庄启智
Owner NANJING UNIV
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